2017-08-06 250阅读
SAT考试是美国高中生进入美国大学的标准入学考试,包括SAT1和SAT2。SAT2是专项测验,有数学、物理、化学、生物、外语等,大部分为选择题,是可以选科的。今天我们来学习SATII化学专题分析 The Chemistry of Acids and Bases,希望对大家的复习有所帮助。
Acid-Base Theories
Let’s start our discussion of acids and bases by dining some terms that are essential to the topics that follow.
Arrhenius acids and bases are:
acid—a substance that increases the concentration of protons (H+) in water
base—a substance that increases the concentration of hydroxide ions in water (OH-)
These dinitions are limited to aqueous solutions.
Brønsted and Lowry acids and bases as:
acid—a substance that donates a proton to another substance
base—a substance that accepts a proton
These dinitions can also apply to reactions that are not aqueous, so they are more accurate.
Lewis acids and bases are:
acid—a substance that accepts an electron pair
base—a substance that donates an electron pair
Here are some other terms that you’ll need to be familiar with:
hydronium (H3O+)—H+ riding “piggyback” on a water molecule; water is polar, and the positive charge of the naked proton is greatly attracted to one of the negative electron pairs on adjacent oxygen
monoprotic—describes acids that can donate one H+
diprotic—describes acids that can donate two H+ ions
polyprotic—describes acids that can donate more than one H+ ion
amphiprotic—describes a substance that can act as either an acid or a base. This means it can either lose a proton or gain one. Water is amphiprotic: it can form either a hydroxide ion or a hydronium ion. Other examples of amphiprotic substances are , ,
以上所介绍的就是SATII化学专题分析 The Chemistry of Acids and Bases,大家在复习的时候可以进行参考。
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